Chemistry daily facts
Chemistry Question Urgent. Please really do help if you know the answer.
a) Lemon juice can be used to remove the brown stains on Chinese wok.
b) Fizzy drink tablets are usually kept in cool dry place.
- YYLv 61 十年前最愛解答
a)brown stains on Chinese wok = rust = Metal Oxide
Lemon juice contain citric acid
Acid + Metal Oxide = salt + water
Hence, Metal Oxide has removed from Chinese wok.
b)Fizzy drink tablets contain hydrogencarbonate
Heat and water cause decomposition of hydrogencarbonate to produce carbon dioxide
To prevent fizzy drink tablets become useless, it should be kept in cool dry place
- WilsonLv 71 十年前
a) brown stains on wok = rust = Fe2O3
lemon contain citric acid
acid dissolve the oxide.
b) contain hydrogencarbonate, wet heat and water cause decomposition.